September Cheyenne extremes
Courtesy of Steve Rubin
|
Cheyenne, Wyoming Since 1872 |
Top Ten Warmest Septembers |
|
Average Temperature (Degrees Fahrenheit) |
Year |
|
63.9 |
1998 |
|
63.1 |
1963 |
|
62.8 |
1979 |
|
62.2 |
1990 |
|
62.1 |
2005 |
|
61.9 |
1897 |
|
61.8 |
1931 |
|
61.7 |
1948 |
|
61.7 |
1994 |
|
61.5 |
2001 |
The table above shows the top ten warmest Septembers in Cheyenne since 1872, in terms of average temperature. September 1998 was the warmest with an average temperature of 63.9 degrees.
|
Cheyenne, Wyoming Since 1872 |
Top Ten Warmest Septembers |
|
Average High Temperature (Degrees Fahrenheit) |
Year |
|
78.2 |
1998 |
|
78.1 |
1979 |
|
77.6 |
1956 |
|
77.0 |
1994 |
|
76.9 |
2005 |
|
76.9 |
1892 |
|
76.8 |
1953 |
|
76.8 |
1948 |
|
76.7 |
1963 |
|
76.6 |
2001 |
As you can see in the above table, September 1998 was the warmest September, in terms of average high temperature. The average high temperature in September 1998 was 78.2 degrees.
|
Cheyenne, Wyoming Since 1872 |
Top Ten Warmest Septembers |
|
Average Low Temperature (Degrees Fahrenheit) |
Year |
|
49.7 |
1998 |
|
49.5 |
1963 |
|
48.6 |
1990 |
|
48.5 |
1940 |
|
48.4 |
1931 |
|
48.3 |
1933 |
|
47.9 |
1897 |
|
47.7 |
1997 |
|
47.6 |
1979 |
|
47.5 |
1911 |
If you look at average low temperatures, the warmest September in terms of average low temperature, was the 49.7 degree average in September 1998.
|
Cheyenne, Wyoming Since 1872 |
Top Ten Coolest Septembers |
|
Average Temperature (Degrees Fahrenheit) |
Year |
|
49.1 |
1912 |
|
49.6 |
1965 |
|
51.4 |
1961 |
|
52.8 |
1985 |
|
52.9 |
1984 |
|
53.0 |
1929 |
|
53.1 |
1971 |
|
53.1 |
1918 |
|
53.4 |
1934 |
|
53.5 |
1878 |
For those of you who enjoy cool Septembers, the table above shows the top ten coolest Septembers in terms of average temperature. The coolest September in this category was in 1912 when the average temperature was only 49.1 degrees.
|
Cheyenne, Wyoming Since 1872 |
Top Ten Coolest Septembers |
|
Average High Temperature (Degrees Fahrenheit) |
Year |
|
60.7 |
1912 |
|
60.8 |
1965 |
|
64.0 |
1918 |
|
64.3 |
1929 |
|
64.5 |
1961 |
|
65.0 |
1973 |
|
65.2 |
1985 |
|
65.9 |
1971 |
|
66.2 |
1913 |
|
66.3 |
1950 |
The table above shows the top ten coolest Septembers, in terms of average high temperature, since 1872. The coolest September in this category was in 1912 when the average high temperature was only 60.7 degrees.
|
Cheyenne, Wyoming Since 1872 |
Top Ten Coolest Septembers |
|
Average Low Temperature (Degrees Fahrenheit) |
Year |
|
37.6 |
1912 |
|
37.6 |
1878 |
|
38.3 |
1961 |
|
38.4 |
1965 |
|
38.9 |
1874 |
|
39.0 |
1934 |
|
39.1 |
1945 |
|
39.2 |
1902 |
|
39.5 |
1984 |
|
39.7 |
1951 |
September 1912 was indeed a cool September with regard to average low temperatures, as you can see in the table above. The average low temperature in September 1912 was a chilly 37.6 degrees.
|
Cheyenne, Wyoming Since 1871 |
Top Ten Wettest Septembers |
|
Total Precipitation (Inches) |
Year |
|
4.52 |
1973 |
|
3.91 |
1912 |
|
3.75 |
1940 |
|
3.52 |
1902 |
|
3.39 |
1995 |
|
3.33 |
1938 |
|
3.28 |
1963 |
|
3.16 |
1993 |
|
3.06 |
2004 |
|
2.87 |
1982 |
The table above shows the top ten wettest Septembers in terms of total precipitation. September 1973 was the wettest with 4.52 inches of precipitation, which includes rain and melted snow.
|
Cheyenne, Wyoming Since 1871 |
Top Ten Driest Septembers |
|
Total Precipitation (Inches) |
Year |
|
0.00 |
1890 |
|
0.00 |
1879 |
|
0.00 |
1876 |
|
0.01 |
1992 |
|
0.02 |
1921 |
|
0.07 |
1899 |
|
0.08 |
1928 |
|
0.09 |
1908 |
|
0.10 |
1953 |
|
0.12 |
1978 |
On the other side of the precipitation spectrum, the table above shows the driest Septembers in Cheyenne weather history. As you can see, there were three Septembers in which no precipitation was recorded, in 1890, 1879 and 1876.
|
Cheyenne, Wyoming Since 1872 |
Top Ten Warmest September High Temperatures |
|
High Temperature (Degrees Fahrenheit) |
Date |
|
95 |
9/1/1995 |
|
93 |
9/4/1960 |
|
93 |
9/1/1960 |
|
92 |
9/5/1998 |
|
92 |
9/3/1960 |
|
92 |
9/2/1947 |
|
91 |
9/17/2000 |
|
91 |
9/6/1998 |
|
91 |
9/4/1998 |
|
91 |
9/3/1998 |
The table above shows the top ten warmest September high temperatures and the dates they occurred, since 1872 in Cheyenne. The warmest September high temperature in Cheyenne was 95 degrees on September 1, 1995. As a matter of interest, notice that all of these records occurred on or before the 6th, with the unusual exception of the 91 degree high temperature on September 17, 2000.
|
Cheyenne, Wyoming Since 1872 |
Top Ten Coldest September Low Temperatures |
|
Low Temperature (Degrees Fahrenheit) |
Date |
|
8 |
9/30/1985 |
|
14 |
9/29/1985 |
|
16 |
9/27/1908 |
|
17 |
9/29/1984 |
|
17 |
9/25/1984 |
|
18 |
9/19/1942 |
|
19 |
9/28/1985 |
|
19 |
9/26/1942 |
|
19 |
9/25/1926 |
|
19 |
9/27/1896 |
The coldest low temperature ever recorded in Cheyenne in the month of September was 8 degrees on September 30, 1985, as you can see in the table above. The table above shows the top ten coldest September low temperatures in Cheyenne since 1872, and the dates the low temperatures occurred. Notice these records all occurred on or after the 19th of the month when the cooling descent towards autumn takes hold.
|
Cheyenne, Wyoming Since 1872 |
Top Ten Coldest September High Temperatures |
|
High Temperature (Degrees Fahrenheit) |
Date |
|
29 |
9/29/1985 |
|
29 |
9/24/1926 |
|
30 |
9/21/1995 |
|
30 |
9/28/1984 |
|
31 |
9/23/2000 |
|
31 |
9/28/1985 |
|
31 |
9/17/1965 |
|
31 |
9/25/1934 |
|
31 |
9/26/1927 |
|
32 |
9/17/1971 |
The table above shows the top ten coldest September high temperatures in Cheyenne since 1872. As you can see, the coldest high temperature ever in September was 29 degrees that occurred on September 29, 1985 and September 24, 1926. Yes, it can remain below freezing all day in September, although this is atypical for September. Interestingly, notice that all these records occurred on or after the 17th of the month as the daily daylight diminishes as we approach and pass the autumnal equinox around September 21st.
|
Cheyenne, Wyoming Since 1872 |
Top Ten Warmest September Low Temperatures |
|
Low Temperature (Degrees Fahrenheit) |
Date |
|
64 |
9/2/1960 |
|
62 |
9/3/1960 |
|
62 |
9/7/1928 |
|
62 |
9/2/1925 |
|
62 |
9/1/1921 |
|
61 |
9/9/2005 |
|
61 |
9/5/1960 |
|
61 |
9/1/1954 |
|
61 |
9/4/1945 |
|
60 |
9/5/1995 |
If you like balmy nights in September, the table above shows the top ten balmiest September nights in Cheyenne since 1872. The warmest low temperature ever in Cheyenne during the month of September was 64 degrees on September 2, 1960. Interestingly, notice how all these top ten records occurred on or before the 9th of the month, and before the typical cool descent towards the autumnal equinox in late September, and the diminishing daylight hours each day.
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